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What's your preferred delivery format for online courses?

Select the format that best matches your learning style and needs, the one you'd prefer to get the majority of the content in given a choice.

I used my Pixel 4 XL to take the photos of a trip to the Space Coast to view a rocket launch.

How did it perform? Not that I had much hardware choice, but writing these notes helped me evaluate the device across dimensions such as capturing distant subjects and rocket launches, night launches, and wide-field photography.

The first mission of my astronaut friend Samantha Cristoforetti to the International Space Station was under Expedition 42. Now she's back in space as a crew member of Expedition 67. Since 6 × 7 = ...

...happy Towel Day!

A circular slide rule for computing the times of key Apollo 11 mission events. Raytheon made it in 1969 likely as a gadget or giveaway for public outreach and education. These days an aerospace company may publish a mobile app instead.

I took this photo at the American Space Museum in Titusville, FL, a great space history venue.

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Stanley Mazor, the architect of the Intel 8080, wrote an article on the development of the CPU. It's interesting as it addresses two common complaints about che chip's architecture, i.e. its lack of register symmetry and of an index register.

See: "Intel 8080 CPU Chip Development":

An International Space Station pass over Milan, Italy, on 21 May 2022. The white dot at left is the ISS, the other the star Capella in the constellation Auriga. The contrail of an airliner crosses the frame diagonally at left.

I took the photo at 19:47 UTC with my Pixel 4 XL.

Serial USB Terminal is the best USB serial terminal emulator app for Android I found. It runs also on Chrome OS, supports basic ANSI escapes and XMODEM, is still being developed, and has a beta program.

I'll use the app to control a Z80 single-board computer connected to my Chromebox.

The wartime mystery novel "The Physicists’ Daughter" by Mary Anna Evans will be released in a couple of weeks.

I was a beta reader and love the story as well as the heroine. I nodded at all the geeky references to physics and the history of 20th century science.

Although only a mockup, standing next to this full-size Space Shuttle partial stack gives you a sense of scale. You really feel you're next to a big spacecraft.

The stack, which combines the external tank (ET) and solid rocket boosters (SRBs), is in front of the Atlantis exhibition at the Kennedy Space Center Visitor Complex.

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I was familiar with the PLY yacc-like parser generator in Python but not with TatSu.

TatSu uses a PEG parser instead of LALR(1) and is interesting for its design decisions, such as separating semantic actions from grammars and using the Python regex module as a lexer.

What blows my mind about Mastodon is not so much its design or tech.

It's that people there read content that interests them and click links. I'm so used to the complete passivity, even apathy, of Twitter users, that what people do on Mastodon never ceases to amaze me.

My memories of the trip to Florida to view the Crew-4 launch from Kennedy Space Center. This flight to the International Space Station carried also my astronaut friend Samantha Cristoforetti.

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To practice Assembly and test the tools I develop, I downloaded the zasm Z80 cross-assembler. Of all the assemblers I researched it's the easiest to install from binaries or build from source, is reasonably powerful, and can assemble also Intel 8080 code.

Here is zasm running in Crostini Linux on my Chromebox.

At the Kennedy Space Center press site I had this view of the turning basin, with the SLS rocket of the Artemis I mission on the pad at launch complex 39B. A crop of the same photo shows better the rocket in full view.

I took the photo with my Pixel 4 XL at 2X optical zoom.

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This is the best Intel 8080 Assembly instruction reference. It's clean, clear, and, unlike similar resources that rank better in web searches, has no ads. Be sure to bookmark it.

The reference is part of a web version of the "Altair 8800 Operator's Manual" scanned from a printout, edited to correct typos, and published as a searchable document along with additional material.

What surprised me most of viewing Space Shuttle Atlantis up close is the level of detail I could make out. The experience was almost hyper-real.

The vehicle is on display at the Kennedy Space Center Visitor Complex.

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Interactive 3D visualization of different satellite constellations with filtering and vehicle identification, created by

I still hold on to my copy of the book "Interactive Programming Environments" edited by D.R. Barstow, H.E. Shrobe, and E. Sandewall and published in 1984.

I like to browse it as a memento of an era of rapid transformation in computing, with the transition from console interfaces to GUIs and the active experimentation of new programming paradigms, development environments, and tools.

NASA's iconic Vertical Assembly Building (VAB) at Kennedy Space Center is huge, yet it's difficult to get a sense of its size even when you're close.

I took this photo from less than half a km away and the building still didn't seem too large. The relatively large angular size of the very close bus didn't lock the scale either.

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Mastodon for Tech Folks

This Mastodon instance is for people interested in technology. Discussions aren't limited to technology, because tech folks shouldn't be limited to technology either!